Pleione formosana (Taiwan pleione or windowsill orchid) is a species of flowering plant in the Orchidaceae family, native to southeastern China as well as northern and central Taiwan. It is a deciduous perennial, terrestrial orchid growing to 15 cm (6 in) tall by 30 cm (12 in) wide, with spherical pseudobulbs that produce a single folded leaf. The pink flowers, borne in spring, have fringed white lips that are strongly marked and mottled with brown on the inner surface. The specific epithet formosana refers to Taiwan's former name, Formosa.